<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>奇怪的Border使用</title>
    <style>       body, ul, li, dl, dt, dd, h1, h2, h3, h4, h5 {
        margin: 0;
        padding: 0;
    }

    body {
        background-color: #F7F7F7;
    }

    .wrapper {
        width: 1000px;
        margin: 0 auto;
        padding: 20px;
        box-sizing: border-box;
    }

    header {
        padding: 20px 0;
        margin-bottom: 20px;
        text-align: center;
    }

    header h3 {
        line-height: 1;
        font-weight: normal;
        font-size: 28px;
    }

    .main { /*overflow: hidden;*/
    }

    .main:after {
        content: '';
        clear: both;
        display: block;
    }

    .main .item {
        width: 210px;
        height: 210px;
        margin: 0 30px 30px 0;
        display: flex;
        position: relative;
        background-color: #FFF;
        float: left;
        box-shadow: 2px 2px 5px #CCC;
    }

    .main .item:after {
        content: attr(data-brief);
        display: block;
        width: 100%;
        height: 100%;
        text-align: center;
        line-height: 210px;
        position: absolute;
        top: 0;
        left: 0;
        color: #FFF;
        font-family: '微软雅黑';
        font-size: 18px;
        background-color: rgba(170, 170, 170, 0);
        z-index: -1;
        transition: all 0.3s ease-in;
    }

    .main .item:hover:after {
        background-color: rgba(170, 170, 170, 0.6);
        z-index: 100;
    }

    .main .item:nth-child(4n) {
        margin-right: 0;
    }

    /*.main .item:nth-last-child(-n+5) {            margin-bottom: 0;        }*/ /* 以上是骨架样式 */ /* 1、2、3、4 顺时针 */
    .border-radius {
        width: 180px;
        height: 180px;
        margin: auto;
        border: 1px solid red; /*border-radius: 50% 30% 20%;*/
    }

    .square {
        border-radius: 0;
    }

    /*拱形*/
    .item:nth-child(1) .border-radius {
        border-radius: 90px;
    }

    /*拱形*/
    .item:nth-child(2) .border-radius {
        border-radius: 90px 90px 0 0;
    }

    /*半圆*/
    .item:nth-child(3) .border-radius {
        height: 90px;
        border-radius: 90px 90px 0 0;
    }

    /*左上角*/
    .item:nth-child(4) .border-radius { /*height: 90px;*/
        border-radius: 90px 0 0 0;
    }

    /*四分之一圆*/
    .item:nth-child(5) .border-radius {
        width: 90px;
        height: 90px;
        border-radius: 90px 0 0 0;
    }

    /*横着的椭圆*/
    .item:nth-child(6) .border-radius {
        height: 90px; /*border-radius: 50%;*/
        border-radius: 90px 90px 90px 90px / 45px 45px 45px 45px; /*border-radius: 45px / 90px;*/
    }

    /*竖着的椭圆*/
    .item:nth-child(7) .border-radius {
        width: 90px;
        border-radius: 45px 45px 45px 45px / 90px 90px 90px 90px;
    }

    /*半个横着的椭圆*/
    .item:nth-child(8) .border-radius {
        height: 45px;
        border-radius: 90px 90px 0 0 / 45px 45px 0 0;
    }

    /*半个竖着的椭圆*/
    .item:nth-child(9) .border-radius {
        width: 45px;
        border-radius: 45px 0 0 45px / 90px 0 0 90px;
    }

    /*四分之一竖着的椭圆*/
    .item:nth-child(10) .border-radius {
        width: 45px;
        height: 90px;
        border-radius: 45px 0 0 0 / 90px 0 0 0;
    }

    /*饼环*/
    .item:nth-child(11) .border-radius {
        width: 40px;
        height: 40px;
        border: 70px solid red;
        border-radius: 90px;
    }

    /*圆饼*/
    .item:nth-child(12) .border-radius {
        width: 40px;
        height: 40px;
        border: 70px solid red;
        border-radius: 60px;
    }

    /*左上角圆饼*/
    .item:nth-child(13) .border-radius {
        width: 60px;
        height: 60px;
        border: 60px solid red;
        border-radius: 90px 0 0 0;
    }

    /*对角圆饼*/
    .item:nth-child(14) .border-radius {
        width: 60px;
        height: 60px;
        border: 60px solid red;
        border-radius: 90px 0 90px 0;
    }

    /*四边不同色*/
    .item:nth-child(15) .border-radius {
        width: 0px;
        height: 0px;
        border-width: 90px;
        border-style: solid;
        border-color: red green yellow blue;
    }

    /*右透明色*/
    .item:nth-child(16) .border-radius {
        width: 0px;
        height: 0px;
        border-width: 90px;
        border-style: solid;
        border-color: red green yellow blue;
        border-right-color: transparent;
    }

    /*圆右透明色*/
    .item:nth-child(17) .border-radius {
        width: 0px;
        height: 0px;
        border-width: 90px;
        border-style: solid;
        border-color: red;
        border-right-color: transparent;
        border-radius: 90px;
    }

    /*圆右红透明色*/
    .item:nth-child(18) .border-radius {
        width: 0px;
        height: 0px;
        border-width: 90px;
        border-style: solid;
        border-color: transparent;
        border-right-color: red;
        border-radius: 90px;
    }

    /*阴阳图前世*/
    .item:nth-child(19) .border-radius {
        width: 180px;
        height: 0px;
        border-top-width: 90px;
        border-bottom-width: 90px;
        border-style: solid;
        border-top-color: red;
        border-bottom-color: green; /*border-right-color: red;*/
        border-radius: 90px;
    }

    /*阴阳图前世2*/
    .item:nth-child(20) .border-radius {
        width: 180px;
        height: 90px;
        border-bottom-width: 90px;
        border-style: solid;
        border-bottom-color: green;
        background-color: red; /*border-right-color: red;*/
        border-radius: 90px;
    }

    /*阴阳图今生*/
    .item:nth-child(21) .border-radius {
        width: 180px;
        height: 90px;
        border-bottom-width: 90px;
        border-style: solid;
        border-bottom-color: green;
        background-color: red;
        border-radius: 90px;
        position: relative;
    }

    .item:nth-child(21) .border-radius::after, .item:nth-child(21) .border-radius::before {
        content: '';
        position: absolute;
        top: 50%;
        width: 20px;
        height: 20px; /*margin: -10px 0 0 0;*/
        border-width: 35px;
        border-style: solid;
        border-radius: 45px;
    }

    /*左阴阳*/
    .item:nth-child(21) .border-radius::after {
        background-color: red;
        border-color: green;
    }

    /*右阴阳*/
    .item:nth-child(21) .border-radius::before {
        background-color: green;
        border-color: red;
        right: 0;
    }

    /*右阴阳*/
    .item:nth-child(22) .border-radius {
        width: 180px;
        height: 90px;
        border-bottom-width: 90px;
        border-bottom-color: green;
        border-bottom-style: solid;
        background-color: red;
        border-radius: 90px;
        position: relative;
    }

    .item:nth-child(22) .border-radius::after, .item:nth-child(22) .border-radius::before {
        content: '';
        position: absolute;
        top: 50%;
        width: 20px;
        height: 20px;
        border-width: 35px;
        border-style: solid;
        border-radius: 45px;
    }

    .item:nth-child(22) .border-radius::before {
        border-color: green;
        background-color: red;
    }

    .item:nth-child(22) .border-radius::after {
        right: 0;
        border-color: red;
        background-color: green;
    }

    /*消息框*/
    .item:nth-child(23) .border-radius {
        width: 160px;
        height: 80px;
        background-color: red;
        border-radius: 6px;
        position: relative;
    }

    .item:nth-child(23) .border-radius::after {
        content: '';
        width: 0;
        height: 0;
        border-width: 10px;
        border-style: solid;
        border-color: transparent;
        border-right-color: red;
        position: absolute;
        top: 16px;
        left: -20px;
    }

    /*奇怪的图形*/
    .item:nth-child(24) .border-radius {
        width: 40px;
        height: 40px;
        border-width: 45px 0 45px 70px;
        border-style: solid;
        border-radius: 0 0 60px 0;
        border-color: red;
    }

    /*奇怪的图形2*/
    .item:nth-child(25) .border-radius {
        width: 100px;
        height: 40px;
        border-width: 45px 20px 45px 70px;
        border-style: solid;
        border-radius: 60px;
        border-color: red;
    }

    /*QQ对话*/
    .item:nth-child(26) .border-radius {
        width: 160px;
        height: 80px;
        background-color: red;
        border-radius: 6px;
        position: relative;
    }

    .item:nth-child(26) .border-radius::after {
        content: '';
        position: absolute;
        top: 0;
        right: -20px;
        width: 30px;
        height: 30px;
        border-width: 0 0 30px 30px;
        border-style: solid;
        border-bottom-color: red;
        border-left-color: transparent;
        border-radius: 0 0 60px 0;
    }

    /*圆角的百分比设置 */
    .item:nth-child(27) .border-radius {
        width: 180px; /*height: 180px;*/
        height: 90px;
        border-radius: 50%;
        border-radius: 90px/45px; /*百分比是按横竖两个对应的方向的长度进行计算*/
    }   </style>
</head>
<body>
<div class="wrapper">
    <header><h3>CSS3 边框圆角</h3></header>
    <div class="main">
        <div class="item" data-brief="整圆">
            <div class="border-radius"></div>
        </div>
        <div class="item" data-brief="拱形">
            <div class="border-radius"></div>
        </div>
        <div class="item" data-brief="半圆">
            <div class="border-radius"></div>
        </div>
        <div class="item" data-brief="左上角">
            <div class="border-radius"></div>
        </div>
        <div class="item" data-brief="四分之一圆">
            <div class="border-radius"></div>
        </div>
        <div class="item" data-brief="横着的椭圆">
            <div class="border-radius"></div>
        </div>
        <div class="item" data-brief="竖着的椭圆">
            <div class="border-radius"></div>
        </div>
        <div class="item" data-brief="半个横着的椭圆">
            <div class="border-radius"></div>
        </div>
        <div class="item" data-brief="半个竖着的椭圆">
            <div class="border-radius"></div>
        </div>
        <div class="item" data-brief="四分之一竖着的椭圆">
            <div class="border-radius"></div>
        </div>
        <div class="item" data-brief="饼环">
            <div class="border-radius"></div>
        </div>
        <div class="item" data-brief="圆饼">
            <div class="border-radius"></div>
        </div>
        <div class="item" data-brief="左上角圆饼">
            <div class="border-radius"></div>
        </div>
        <div class="item" data-brief="对角圆饼">
            <div class="border-radius"></div>
        </div>
        <div class="item" data-brief="四边不同色">
            <div class="border-radius"></div>
        </div>
        <div class="item" data-brief="右透明色">
            <div class="border-radius"></div>
        </div>
        <div class="item" data-brief="圆右透明色">
            <div class="border-radius"></div>
        </div>
        <div class="item" data-brief="圆右红透明色">
            <div class="border-radius"></div>
        </div>
        <div class="item" data-brief="阴阳图前世">
            <div class="border-radius"></div>
        </div>
        <div class="item" data-brief="阴阳图前世2">
            <div class="border-radius"></div>
        </div>
        <div class="item" data-brief="阴阳图今生">
            <div class="border-radius"></div>
        </div>
        <div class="item" data-brief="阴阳图今生2">
            <div class="border-radius"></div>
        </div>
        <div class="item" data-brief="消息框">
            <div class="border-radius"></div>
        </div>
        <div class="item" data-brief="奇怪的图形">
            <div class="border-radius"></div>
        </div>
        <div class="item" data-brief="奇怪的图形2">
            <div class="border-radius"></div>
        </div>
        <div class="item" data-brief="QQ对话">
            <div class="border-radius"></div>
        </div>
        <div class="item" data-brief="圆角百分比">
            <div class="border-radius"></div>
        </div>
    </div>
</div>
</body>
</html>